Before, high blood pressure was defined as a reading of 140/90 or higher. Now, according to the new guidelines, high blood pressure is defined as 130/80 or higher, CNN reports.

Scientists reviewed more 900 studies to create these guidelines, and determined that, under the new criteria, 46% of Americans now have high blood pressure. Previously, only 32% of Americans did.

As a quick refresher: The top number (systolic blood pressure) indicates the amount pressure that your blood puts on your arteries every time your heart beats. The bottom number (diastolic blood pressure) measures the pressure on your arteries when your heart is resting in between beats.

But if you haven't gotten your blood pressure checked in a while, now might be a good time to do it. You don't even have to see a doctor — pharmacies like CVS and Walgreens offer screenings, too. And for more on the importance of health blood pressure, check out this guide from the AHA.